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IntroductionNo document tells us that there was a new manual or even a correction to the 1938 manual. However, at the beginning of 1939 the Enigma procedure changed slightly: the group containing the kenngruppe was systematically placed in first position. No doubt the variable position generated too many errors. Perhaps no changes had taken place in the procedures, but quite simply the location of the group containing the kenngruppe was always indicated in the first position in the key tables. Messages deciphered by the Allies from January to May 1940 followed this procedure.
We can notice that: Example of decryptionHere is an example of an key list. It is fictitious. No one from this period have been found. Geheim - Heer - Maschinenschlüssel für Monat Juli 1939 - N°763 Kengruppen Einsatzstalle Gruppe: 1 Tag Walzenlage Ringstellung Steckerverbindungen Kenngruppen 31 III V IV 24 20 3 BK CQ HI MX JP NZ AR ST urh bkf mxs hqe 30 IV I II 8 12 10 NW CQ BO FL DK SZ GX oeg iyo rnv naj 29 V III I 22 7 5 MS QW HN AU IY OR JV LZ kep swl lpe ntf 28 V IV III 10 6 19 EH KZ IW NV BT DU GY ypc zdz zqd rpu 27 III II V 17 19 4 GJ LM DS HP FR EY OT ytm cwh xvk rhu 26 II I V 24 3 23 HP UX BL IM NO FW DJ AG ohu nvx tie phj 25 III I IV 7 20 18 OV SX FQ TU GI DL YZ ujx ycs pxh gyvTry to decipher the following message received on July 25: 1230 – 98 = HIT = GJVCS RDMNZ OOKOB MUOXM QJQNX VQHYV FXOBF BVKJZ VFZZJ DJPNX SDDLW MHODX QZLSA VMTFN MCUCB JSWOX VTFDE CJKDG XKUZN WFC |